We bought a rucksack style one off Amazon that DH is happy to be seen wearing for about £30. Opens up really wide, has insulated pockets, wipes pocket etc. There's quite a few on there, I can't remember which one it is exactly.
If we like it we'll get a second as I'm sure we'll need it even if it's not until they (and their spare clothes get bigger). Or if it sucks we'll get something else.
I'm craving red wine at the moment rather than iced tea. I really just want to smell it but DH doesn't really drink so it'd be a waste to open a bottle.